The Acts of Bishop Montague, by W. D. Peckham, published 1947 in Sussex Archæological Collections (vol. 86, article, pp.141-154) accessible at: W.S.R.O. [Lib 2171] & The Keep [LIB/500343] & S.A.S. library
Bishop Montague's Personal Accounts, 1636-1638., by Francis W. Steer, published 1957 in Sussex Archæological Collections (vol. 95, article, pp.28-41) accessible at: W.S.R.O. [Lib 2180] & The Keep [LIB/500334] & S.A.S. library
Richard Montague, Caroline Bishop, 1575-1641, by J. S. Macauley, 1964 at Cambridge University (Ph.D. thesis)
Cowdray and the Viscount Montague, by A. A. Dibben, published September 1975 in Sussex Family Historian (vol. 2 no. 2, article, pp.57-60) accessible at: W.S.R.O. [Lib 7966] & The Keep [LIB/501254] & CD SFH40 from S.F.H.G.
Anthony Browne, 2nd Viscount Montague and his Sussex Flatterers, by Timothy J McCann, published 1989 (article) accessible at: W.S.R.O. [Lib 11212/p396-410]